.demo {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: auto;
}

.from {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 9;
  text-align: center;
  color: #ffffff;
  background-color: #006bd5;
}

.mapbox {
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, .8);
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10;
}

.box {
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 6;
  overflow: hidden;
}

.box > div {
  width: 50%;
  height: 400px;
  margin: 0 auto;
}

.yulan {
  width: 100%;
  height: 100%;
  text-align: center;
  line-height: 8rem;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 8;
  background-color: rgba(255, 255, 255, 0.5);
  overflow: hidden;
}
